1 Answer
1

Yes

The rules for Concealment describe the order of operations for miss chance thusly:

Concealment gives the subject of a successful attack a 20% chance that the attacker missed because of the concealment. Make the attack normally—if the attacker hits, the defender must make a miss chance d% roll to avoid being struck. Multiple concealment conditions do not stack. (emphasis mine)

We can see from this that the miss chance is only ever rolled when the attack roll already indicates a hit. Therefore, the process that occurs when a natural 20 is rolled is:

Attacker rolls 20.

Attacker rolls to confirm Critical Threat.

Defender rolls for miss chance.

However, this ordering is not strictly necessary, since the attack and miss chance die rolls are all independent. If you don't enjoy raining on your players' parades when they roll natural 20s, I suggest rolling for miss chance before the attack roll, rather than after.